Aerobar extensions with a sole purpose to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position.50a extensions offer a 50degree ski bend shapeThe 50a offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touchDesigned for cables to be routed out the rear of the extensions so do not have cable exit holes